Hydraulic steering arrangement

Abstract

The invention concerns a hydraulic steering arrangement with a hydraulically actuated steering valve arrangement, steering motor connections (CL, CR), which are connected to supply connections (HP, T) via the steering valve arrangement, and a steering unit. It is endeavored to equalize in a simple manner the steering behavior in both directions. For this purpose, it is ensured that the steering valve arrangement has a directional valve and a flow control valve.

What is claimed is: 
     
       1. A hydraulic steering arrangement with a hydraulically actuated steering valve arrangement, steering motor connections, which are connected to supply connections via the steering valve arrangement, and a steering unit, wherein the steering valve arrangement has a directional valve and a flow control valve, wherein a stop valve, which is activated by a pressure at a pressure outlet of the flow control valve, creates a fixed stop for the steering unit, when a steering motor connected to the steering motor connections (CR, CL) is in an end position. 
     
     
       2. The steering arrangement according to  claim 1 , wherein the directional valve is placed after the flow control valve in the direction from the supply connections (HP, T) to the steering motor connections (CR, CL). 
     
     
       3. The steering arrangement according to  claim 1 , wherein a control inlet arrangement of the directional valve is connected to the steering unit and a control inlet of the flow control valve is connected to the directional valve. 
     
     
       4. The steering arrangement according to  claim 1 , wherein the flow control valve has a larger activation pressure than the directional valve. 
     
     
       5. The steering arrangement according to  claim 1 , wherein the steering unit has a manually actuated control device, which has a pressure connection (PS) and two directional connections (L, R), the pressure connection (PS) being connected to a pressure source arrangement by means of a pipe path led through the flow control valve. 
     
     
       6. The steering arrangement according to  claim 5 , wherein in the area of the end position of the flow control valve, which permits a maximum supply flow to the steering motor connections (CL, CR), the pipe path is throttled. 
     
     
       7. The steering arrangement according to  claim 1 , wherein the directional valve and the flow control valve each have a slide. 
     
     
       8. The steering arrangement according to  claim 1 , wherein a supply connection (T) connected to a tank has a pre-set non-return valve opening in the direction of the tank. 
     
     
       9. The steering arrangement according to  claim 1 , wherein the steering unit has an electrically actuated control valve. 
     
     
       10. The steering arrangement according to  claim 9 , wherein the control valve is connected to the control inlet of the flow control valve, the flow control valve being connected to the control valve via a feed-back unit. 
     
     
       11. A hydraulic steering arrangement with a hydraulically actuated steering valve arrangement, steering motor connections, which are connected to supply connections via the steering valve arrangement, and a steering unit, wherein the steering valve arrangement has a directional valve and a flow control valve, wherein a stop valve, which is activated by a pressure at a pressure outlet of the flow control valve, creates a fixed stop for the steering unit, when a steering motor connected to the steering motor connections (CR, CL) is in an end position, wherein a change-over valve is located between the directional valve and the flow control valve, the outlet of the change-over valve being connected to a supply inlet of the directional valve, the supply inlet being connected to one of the two steering motor connections (CL, CR) in dependence of an actuation direction of the directional valve, a first inlet of the change-over valve being connected to a pressure outlet of the flow control valve and a second inlet of the change-over valve being connected to the steering unit via the directional valve. 
     
     
       12. A hydraulic steering arrangement with a hydraulically actuated steering valve arrangement, steering motor connections, which are connected to supply connections via the steering valve arrangement, and a steering unit, wherein the steering valve arrangement has a directional valve and a flow control valve, wherein a stop valve, which is activated by a pressure at a pressure outlet of the flow control valve, creates a fixed stop for the steering unit, when a steering motor connected to the steering motor connections (CR, CL) is in an end position, wherein the steering unit has an electrically actuated control valve, wherein the steering unit and the control valve are connected to the control inlet arrangement of the directional valve via a change-over valve arrangement.